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G&P Complete 8mm Reinforced Gear Box for M4 M16 Airsoft AEG (Configuration: Rear Wired / Standard Deans / 400+ FPS)

ID: 39750 (GB-GP-EV-GB003B)
4.5 stars, based on 22 reviews
G&P Complete 8mm Reinforced Gear Box for M4 M16 Airsoft AEG (Configuration: Rear Wired / Standard Deans / 400+ FPS)
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MAP ProtectedExempt From Coupons
The manufacturer of this product enforces a strict minimum advertised price (MAP) policy which excludes this product from any additional discount coupon codes. This item, however, may qualify for free shipping.


  • Drop in upgraded gearbox works with most M4/M16 receivers as well as other AEGs that utilize a version 2 gearbox
  • Durable, reinforced G&P construction ensures reliable operation and lifespan as well as easy to replace, upgradeable components
  • Complete gearbox
  • 8mm steel bearings. steel gears and numerous high grade components make this one of the most reliable gearboxes on the market
  • Utilizes screw type motor connectors
Power: ~400 + FPS
Wiring and Connector: Front wired with a standard Deans plug
Compatibility: Most popular M4/M16 series AEGs or other AEGs that utilize a Version 2 gearbox
Material: Aluminum, Steel, Metal Alloy

Manufacturer: G&P

About G&P

Established in 1995, G&P is among the oldest Military-simulation and training Airsoft manufacturers in the world. Started as a top combat light provider for law enforcement and military agencies around the world, G&P branched into Airsoft manufacturing with the same belief to never sacrifice quality for lower price. Their motto is visible on every G&P product. Every G&P AEG rifle is hand assembled and individually fine-tuned by top technicians in the industry to match G&P's unparalleled quality and reputation. G&P utilizes CNC precision machining and real-steel finish/coating processes on many of their products.

22 Customer Reviews

(Write a review)

by Bradley L. on 03/15/2016
"1) motor wires are too fat for motor to fit properly
2)trigger contacts stuck after pulling trigger a few times using a 9.6v
3)motor connectors are specific to g&p motors only

Pain in the butt gearbox I wouldn't reccomend unless you are patient and a good airsoft mechanic with lots of time.
by matthew s. on 02/09/2016
"Got this for my g&g cm16. Dropped right in with a little snug fit. Had to do some wire splicing for the battery. The motor wiring is a little different so if you're doing this for your g&g then you'll also need a better torque motor and I'm investing in a more qualified handgrip too
by Kim L. on 10/21/2015
"I've had multiple G&P's in the past and they have all been great. This is the standard gearbox for most of them, and there are only two main problems with them; the trigger contacts burn out quickly if you have deans or use semi auto a lot, and they shoot high FPS. The second one is not a problem if you go to a field that is not very strict. My field only allows up to 425 FPS and two of my three working G&P's shoot about 430-450, the last shooting 380 because its old and the O-rings on the piston are probably worn.
Overall great gearbox, but just be ready to replace the wiring harness. Also, note that the motor contacts are strictly for G&P motors on this gearbox.

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